She warned Mr Kelly to hide in her wardrobe, and then opened the front door, still concerned about their daughter.

Samantha Brown, the depute fiscal, said Barkham “pushed past her into the house and went straight into the bedroom”.

Mr Kelly, who was sitting on the end of the bed, saw a knife, and put his arms up to defend himself. He then felt what he thought was a punch.

He escaped into the street in his bare feet, “trying to orientate himself”.

He tried unsuccessfully to flag down several cars without success, before realising he was bleeding heavily.

He took off his T-shirt to try to staunch the blood, and phoned a work colleague, who managed to find him and take him to hospital.

Doctors found he had a “significant facial slash above the left jaw line, consistent with a knife injury”.

Ms Brown said he had been left with a “substantial scar”, suffered flashbacks, and was now fearful of going into pubs.

After the incident Angie called her brother-in-law, who went straight to her house, while Barkham made yet another phone call, this time telling his estranged wife, “You have broken my heart”.

Police found “a trail of blood leading from the property” and arrested Barkham at his home, five minutes walk away.

Barkham, of Bo’ness, pleaded guilty to assaulting Mr Kelly to his severe injury and permanent disfigurement.

The incident occurred on June 2nd (2017).

Defence solicitor Frazer McCready said: “On the evening in question he had taken alcohol, and at the time he was taking steroids for body-building.

“He was regularly attending at the gym.

“He discovered his wife had a man in the house.

“He accepts the red mist came down -- he was extremely jealous.”

Mr McCready said after the incident Barkham “realised he had a difficulty”.

He said: “He has remained away from alcohol and steroids.”

Imposing the 20 month jail term, Sheriff John Mundy told Barkham: “To go into somebody’s house with a knife and assault someone with it, striking him in the face with it to his permanent disfigurement, will not be tolerated.”